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采用不连续双垂直板（２０ｃｍ×２０ｃｍ）聚丙烯酰胺凝胶电泳法，对泡桐属５种植物的ＳＯＤ同工酶和可溶性蛋白质进行分析，发现楸叶泡桐杂合性较高；白花泡桐较原始；推测山明泡桐是兰考泡桐和毛泡桐的杂交种，从而为泡桐属植物的分类提供了生化上的参考佐证。
Analysis of SOD isozymes and soluble proteins in 5 species of Paulownia by polyacrylamide gel electrophoresis with discontinuous double vertical plates (20 cm × 20 cm) showed that there was a high heterozygosity in Paulownia papeo It is speculated that P. sagittana is a hybrid of L. pakistani and P. guianensis and thus provides a biochemical reference for the classification of L. sativa.